Kit assembly is now available.

Contact Chris at < kd4pbj@gmail.com>or

1.5KW Diplexer Filter

RF amplifiers require low pass filters to get rid of harminics. This series of boards will provide a low pass filter to block the harmonics from getting to the antenna, and a high pass filter to route the harmonics to a 50 ohm "dump" resister. Each section is a 7 pole Chebychev low pass and 7 section high pass filter. Unlike a low pass only filter, this filter presents a good match to the amplifier at all frequencies. The boards are approximately 8" by 2" on .126" FR4 with 2oz copper for each band.

1.5 KW Diplexer PCB USA $13.00

1.5 KW Diplexer PCB Outside USA $17.00

100W Low Pass Filter Board

The board contains 7 relay switched 5 pole low pass filters.

Circuitry is provided for control via a I2C bus connection.

Test points are provided for manual operation. The board is 3.0" by 7.2 ".

Production boards and kits(PCB and Parts, no case) available now. .

MPLPF PCB USA $13.00

MPLPF PCB OUTSIDE USA $17.00

MPLPF KIT USA $85.00

MPLPF KIT OUTSIDE USA $93.00

USBI2C

The USBI2C is a small(1" by 1-3/8") board designed to provide USB control of SDR radioes that use the Si570. The board will plug into H1 on the UHFSDR or H2 on the Si570 boards. Firmware was written by PEOFKO originally for the softrocks.

UHFSDR

The UHFSDR is a Software Defined Transceiver covering the 1.75 MHz to 700 MHz frequency range. A Si570 is used for frequency control. Two LVPECL 4 GHz max.flip flops produce I and Q LO signals at 1/2 the Si570 frequency. A pair of 1-1000MHz Double Balanced Mixers are used to convert signals to and from base band. A receiver pre-amp (2dB noise figure) and a transmit pre-amp(50mW max output) are provided as well as antennal switching plus provision for separate receive and transmit connections. For additional information, download the Assembly Manual. The BOM, schematic, and board layout are Here. A HiRes(3.7MByte>) picture of the completed board is Here . A plug in USB interface(USBI2C) is now available.

Dave Miller-VE7PKE and the AQRP group are working on a board with a LCD and an STM32F4 ARM processor to replace the PC. Info at STM32-sdr .

The Si570 may be ordered at

Si570 Board

A 1" by 1.35" circuit board has been designed for the Si570 programmable crystal oscillator chip. The board contains the Si570(NOT included in kit), a 3.3V regulator, a bidrectional level shifter for the I2C inputs, an optional droppoing resister(for 12V use),sma outputs, and headers for I2C control, power input, VCXO control(used on Si571 only),
The board will also work with other oscillators in the standard 5 X 7 can.

The parts kits contain the following:

995x

The AD995x board contains a USB controller, a DDS(AD9951, AD9952, AD9953, or AD9954), a quadrature generator, and a Quad Sampling Detector(QSD). By populating appropriate parts of the board the board may be used for the following:VLF to VHF signal generator with programmable output power. Receiver covering at least VLF to 54MHz or above with connection to a suitable PC and soundcard. The addition of the BPF Board(controllable from the PIC controller) provides a complete receiver. Receiver and transceiver VFO with quadrature generation and receiver control.Spectrum Analyzer with tracking generatorVNA(requires slight modification of the QSD circuit to provide DC coupling). For a full description of the operation of the board click on left.

For a discussion of this board and associated software being developed join the DDS_Controller Group .

Discussion group for a group buy of parts for the 995x board is here .

. I have included values for 3 different LPF designs depending on the clock frequency used. Uncheck the values for L1,L2 and L3 as well as C26-C32 for the LPF freq. you are not using.

995x_PCBFor USA Delivery

$9.00 each

995x_PCB For Outside USA

$13.00 each

Band Pass Filter

The BPF board contains
6 Band Pass Filters. Each can be up to 7 element Cheb. or
elliptic in complexity. Coils can be any size from 0603 to
1810. The schematic shows my design for six 7 element filters
designed for a general coverage receiver from 1.8 to 30 MHz. The
filters are selected by 3 CMOS control lines. In addition,
the board has transformer input and the control and RF grounds are
joined at a single point.

Click on BPF Board on left for board design documentation and engineering measurement made on the board.

This board was part of the Software Defined Transceiver. A Cypress CY7C68013A provides a high speed (480Mbps) USB 2.0 interface and an 8051compatable microprocessor. The design has been ported over KICAD. This would be a good board to use with 192 KHz A/D and D/A converters. High speed USB 2.0 is specified as 40 times faster than "full speed" USB 2.0 that is in the PIC USB devices. These boards are also compatable with the N2PK VNA.